And the single right answer is...?

The name of Tom Mix horse.
The name of the RCA Dog who is waiting for his Master's Voice.
42
What a Church Key is.
That ALL beer is brewed cold.
Big Momma Thornton.
Who's on first?
That "Frankie & Johnny were lovers" is not about a same sex marriage.
That it's always 5 o'clock somewhere.
That you can tune a piano but you can't tuna fish.
Why there was a baby face on the bottle.
Mississippi John Hurt.
When the Cuyahoga River caught fire.
A B-9 Class M-3 General Utility Non-Theorizing Environmental Control Robot said ...?
Fulda Gap.
Hof Corridor.
Formosan Strait.
Quemoy & Matsu.
Bikini Atoll.
Widdershins.

There is one thing in common to all the stuff listed though and I was hoping someone would see the connection.

that's right by the way but still not what is common to all the questions

It's a partial list of things that elicit blank stares from anyone under about 50 today.

Sadly, Tom Mix got killed by his suitcase.